Belief in God is rational.
Everything has a cause. So unless there is a first cause, then you would have an infinite regress. And then nothing could exist. Therefore there must be a first cause. Therefore God, the first cause, exists. QED. (You could prove the first step a priori that everything has a cause by noting that nothing can come from nothing. This makes it a priori, not just an empirical observation).

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21.4.17

the baali teshuva /newly religious.

The religious world was putting forth great effort to get Jews to be religious. [In the sense of keeping trivial rituals at the expense of the more weighty factors like honoring one's parents.] [Certainly no religious organization was interested in strengthening one's observance of that mitzvah.] But there was more about it that was odd. No one has documented much of the spiritual abuse and the taking advantage of the baali teshuva [''newly religious'']. Maybe it is the prohibition of ''Lashon Hara'' [slander]?

But the main focus seems to have been to create a slave caste to support the supposedly superior "frum [religious] from birth". The whole thing reeked of hypocrisy and fraud until it gave a bad name to the holy Torah.
For themselves they would encourage and parade family values, but for baali teshiva
they would encourage their wives to divorce them, and the sexual abuse of the children from those marriages was rampant in the frum world. While pretending holiness and higher moral standards they would act like the most depraved of humans. I have long sought for a reasonable explanation of this phenomenon, and the best I could find was the influence of the Shatz and that whole movement that the Gra put into excommunication.

[It is not to say that the Litvak world [Yeshiva World based on the Gra] is immune. Just the opposite. They allowed elements from those movements to get inside, and thus partake of many of the flaws of fraud and spiritual uncleanliness.

So the solution, I imagine, would be simply to pay attention to the excommunication of the Gra. That would seem to be obvious. But for some reason, this obvious solution is ignored except by Rav Silverman in the Old City of Jerusalem and to some degree Ponovitch.

Appendix:
Rav Zilverman is the Rosh Yeshiva of Aderet Eliayhu which is the first yeshiva to specifically do everything according to the Gra. Since then, others have started. Ponovitch tends towards that approach also much more so than any American Yeshiva.